#!/usr/bin/env python3
# -*- coding:utf-8 -*-
###
# File: recur.py
# -----
# Description: 递归函数
# -----
# Created  By: Aim 2020-01-29 18:23:21
# Modified By: Aim 2020-01-29 19:41:46
# -----
# HISTORY:
# Date      	By	Comments
# ----------	---	----------------------------------------------------------
###


def fact(n):
    if n == 1:
        return 1
    return n*fact(n-1)

print(fact(100))